The last couple of 5s have been decent enough but fairly bland for me. The E60 was a bit out-there but has aged well and made the two following generations look dull. And because it's so big and bulky now too, they don't have that minimalist look of pre-E60 5-series to fall back on either.
The X1 I'm not keen on, but part of that is proportions. The original X1 was no looker but the proportions were way better, as it was basically a RWD platform car instead of a FWD platform one. Current 1-series suffers exactly the same way - even if its details were better it'd still have the proportions of a ten-year-old Korean hatchback.
I think proportion is the main thing BMW's lost with recent generations, way more so than any concerns about grilles or whatever. For all the complaining people did about the Bangle era (ignoring that Bangle was also behind cars like the E46 3-series), proportions were still always spot-on. Minimal front overhang, long bonnet, Hoffmeister right over the rear axle line, great body to glass ratio etc.
Current 3/5/7 are still fairly close if you view them directly from the side, but out on the road stuff like the wide grilles, messy bumpers and indistinct side surfaces chip away at that, while the FWD-based stuff is just lumpen. The F20 was no oil painting but it still feels way more "BMW" in its basic form than the current 1-series.
And yeah, weirdly, cars like the X3 or X5, while I'm not keen on the way they look to start with, have probably suffered less than most.